PBS不同化学结构共聚物的性能

Properties of Poly(Butylene Succinate)(PBS) with Various Chemical Structures

采用改变原料的组分合成不同化学结构的聚丁二酸丁二醇酯(PBS)改性共聚物:聚丁二酸丁二醇/己二酸丁二醇酯(PBS-co-BA)、聚丁二酸丁二醇酯/聚丁二酸乙二醇酯(PBS-co-ES)、聚丁二酸丁二醇酯/聚丁二酸己二醇酯(PBS-co-HS),利用FT-IR和1H-NMR表征共聚物的化学结构,并对共聚物的结构与物理性能、降解性能的关系进行对比。研究结果表明:所有共聚物的结晶度、熔点较其均聚物有所降低;但所有共聚物的断裂伸长率都有所提高。热分析结果表明:PBS-co-HS热性能有所提高,PBS-co-BA和PBS-co-ES有所下降。堆肥降解实验表明:所有共聚物的降解性都比均聚物有显著提高,其降解速度大小顺序为:PBS-co-BA>PBS-co-HS>PBS-co-ES>PBS,PBS-co-HS是综合性能最优良的材料。

Polyesters with different chemical structures, such as poly （ butylene succinate） （ PBS ） , poly （ butylene succinate） -co-（ ethylene succinate ） （ PBS-co-ES ） , poly （ butylene succinate ） -co-（ hexane succinate ） （ PBS-co-HS ） , poly （ butylene succinate） -co- （ butylene adipate） （ PBS-co-BA ）, were synthesized via direct polycondensation. Their chemical structures were identified by FT-IR and ~H-NMR,the relationships between chemical structures and physical properties,biodegradabilities were compared. The results indicated that the compared with pure poly （butylene succinate） , the copolymers had lower melting points and lower degrees of crystallinity and increased elongations at break. The results of TG indicated that the thermal stability of PBS-co-HS were improved compared with PBS, while PBS-co-BA, PBS-co-ES declined. Composting degradation experiments showed that the degradation rates of copolymers remarkably increased compared with homopolymer. The order of their degradabilities was ： PBS-co-BA 〉 PBS-co-HS 〉 PBS-co-ES 〉 PBS. PBS-co-HS was a comparatively good candidate.